Typewriter



Jan; 12, 1943;

' J. Q. SHERMAN TYPEWRITER Filed Oct. 1, 1958 5 Sheets-Sheet 1 Jan. 12, 1943. J. Q. SHERMAN 2,307,809

TYPEWRITER Filed Oct. 1, 1958 5 Sheets-Sheet 2 mvzm-oa z/ahw Q. SHERMAN Jar-1.12, 1943. 1 J. QS EWN 2502809 v T'YPEWRITER Filed Oct. 1, 1958 5 Sheets-Sheet 3 O T v N 1 HERMAN AATT RNEV Jan. 12, 1943-" ,J. SHERMAN TYPEWRI'I'ER Filed Oct. 1, 193a sheetssheet 4 I Jan. 12,1943.

J. Q. SHERMAN TYPEWRITER Filed 001:. 1, 1938 5 Sheets-Sheet 5 INVENTOR' Joy/v0. HERMA/V @EQWMW ATTO NEY Patented Jan. 12, 1943 UNITED STATES TYPEWRITER deceased Application October 1, 1938, Serial No. 232,827

' 20 Claims. (01.197-126) This invention pertains to writing and imprinting apparatus of the type wherein a platen roll is mounted for to and fro shifting movement into and out of writing position to enable introduction of record receiving sheets or cards there: beneath or to facilitate periodic shifting adjustment of relatively short sheets of transfer material interleaved between superposed record strips out of registry with inscribed portions of the strips into transfer relation with a succeeding set of forms to be inscribed, and pertains more particularly to means for mounting and controlling the to and fro movement of the platen and for automatically maintaining accurate registry of superposed forms and hold the record strips against retrograde movement during retraction of the interleaved transfer material.

The invention is herein shown and described as applied to a Well known form of writing or billing machine of the type originally disclosed in Letters Patent of Wernery and Smith, 1,132,- 055, of March 16, 1915, and which has been the subject matter of sundry subsequent Letters Patents, including 1,304,213 to Smith, May 20, 1919; No. 1,349,015 to Stickney, August 10, 1920; No. 1,425,293 to Smith, August 8, 1922, and others.

Modern commercial usage of printed forms having closely spaced lines and restricted spaces in which data is to be inscribed necessitates accurate registry and alignment of the corresponding forms upon superposed strips in order that the inscriptions produced upon underlying forms may be in exact accord and positioned identically with those upon the topmost or original record.

Marginally punched series connected continuous from stationery for use with pin type feeding devices progressively engageable in the marginally punched holes for insuring accurate alignment and registry of the printed forms upon such strips are now extensively used and commercially available.

For illustrative purposes, but with no intent to unduly limit or restrict the scope or application of the present invention, there are shown and described herein radially disposed reciprocatory feeding pins operable in alternate positions circumferentially of the platen roll of the type which forms the subject matter of Sherman Patent No. 2,000,651, of June 8, 1935. Theconstruction and arrangement is such that the pins which have feeding engagement with the record strips to progressively advance the strips during writing or imprinting operations are automatically adjusted circumferentially of the platen simultaneously with the shifting movement thereof,

whereby they are caused to retain their engagement with the strips throughout the range of the platen movement and duofunctionally serve to detain the strips against retrograde movement under retractive frictional influence of the interleaved transfer material. It is to be understood, however, that the invention is not limited to the use of the particular pin feed devices, but other embodiments of detent means performing like function of detaining the strips upon movement of the platen may be provided within the scope of the present invention.

The object of the invention is to improve the construction as well as the means and mode of operation of such type of writing and imprinting mechanism whereby it may not only be economically manufactured, but will be more efficient in use, automatic in action, uniform in operation, having minimum operating parts, and unlikely to get out of repair.

A further object of the invention is to provide automatic detent means, automatically effective upon raising of the platen for holding the record strips against retrograde motion during retraction of the transfer material.

A further object of the invention is to provide duofunctional feeding and detent means whereby the means employed for advancing the record strips when the platen is in normal position is also effective for holding the strips in their advanced position while the platen is raised.

A further object of the invention is to provide strip detent means automatically rendered effective by the shifting movement of the platen roll.

A further object of the invention is to provide improved paper guide means for maintaining the record material in adjusted relation with the platen roll in various positions of relative adjustment of the platen roll.

A further object of the invention is to enable improvement of existing writing and imprinting machine of the shifting platen type by addition of automatic detent means and paper guide means thereto.

A further object of the invention is to provide in a writing or imprinting machine of the shifting platen type the structural features of advantage and inherent meritorious characteristics herein mentioned.

With the above primary and other incidental objects in view as will more fully appear in the specification, the invention intended to be protected by Letters Patent consists of the features of construction, the parts and combinations thereof, and the mode of operation, or their equivalents, as hereinafter described or illustrated in the accompanying drawings.

In the accompanying drawings, wherein is shown the preferred but obviously not necessarily the only form of embodiment of the invention,

Fig. 1 is a perspective view of an assembled billing apparatus or writing machine and carbon shifting attachment to which the present invention is applied.

Fig. 2 is a perspective view of a portion of a writing machine in which the present strip feeding and detent means is embodied.

Fig. 3 is a side elevation of the platen carriage with the platen in its depressed or writing position.

Fig. 4 is a similar View showing the platen roll retracted or elevated to enable retraction of the transfer material or insertion of additional record sheets or cards.

Fig. 5 is an end view of the platen roll and feeding unit with the pin control lever in its normal position corresponding to Fig. 3.

Fig. 6 is a sectional View through the pin type feeding unit with the parts in the position shown in Fig. 3 and as shown in Fig. 5.

Fig. 7 is a front elevation of one end of the platen roll with the parts in the position shown in Figs. 3. '5 and 6.

Figs. 8, 9 and are similar views corresponding to Figs. 5, 6 and 7 showing the various parts in their retracted positions corresponding to Fig. 4. Fig. 8 is an end view of the platen roll and pin control devices when the platen is in elevated position. Fig. 9 is a sectional view through the pin type feeding unit with the parts in the same position. Fig. 10 is a front view of one end of the platen roll with the parts in like position.

Fig. 11 is an axial sectional detail view through one end of the platen roll and one of the pin type feeding units.

Figs. 12 and 13 are detail views of the platen detent means with the platen in elevated and depressed relation respectively.

Like parts are indicated by similar characters of reference throughout the several views.

Referring to Fig. 1 of the accompanying drawings, I is a typewriter of conventional form in which a swinging platen is embodied. At the rear of the typewriter is a stand or rack 2 over I which superposed strips 3 of record material are advanced to the typewriter 1 from a supply packet 4. Mounted on the rack or stand 2 for to and fro reciprocatory motion is a carbon carrier 5 to which are attached sheets of carbon or transfer material interleaved between the record strips. Such carrier 5 and the interleaved transfer material advance in unison with the record material until inscription of a set of forms is completed, whereupon the swinging platen is elevated to release the tension upon the record strips and enable the strips to straighten, whereupon the carrier and with it the interleaved sheets of transfer material are manually retracted by means of the push arm 5 attached to the carrier 5.

The platen roll I of the writing machine I is journaled in a pair of swinging arms 8, of which there is one at each end of the platen roll. The swinging arms are pivoted to short links 9, which are in turn pivoted to the brackets l0 attached to the end frames H of the platen carriage. To guide the platen in its to and fro swinging movement, slotted extensions l2 are provided on the carriage end frames, having therein arcuate slots I 3 disposed reversely relative to the pivotal connection of the swinging arms 8. Guide rollers It on the inner sides of the swinging arms 8 travel to and fro in the slots I3 and transmit to the platen roll slight fore and aft motion in unison with its to and fro swinging movement. A spring actuated hook IE on each swinging arm 3, by its engagement with a lug l6 on the corresponding end frame, serves to lock the platen roll in its depressed and operative position. Pivoted at ll on the end frame II is a U-shaped lever i8 which controls the carriage release. Pivoted at the front of the platen carriage to the end frames ll is a pair of upwardly extending swinging arms I9 connected at their upper free ends by a transverse rod 20, which in the conventional writing machine comprises a tearoff knife.

For manifolding purposes it is quite necessary and essential that the superposed record strips 3 of continuous series connected printed forms be advanced into and past the writing position in exact registry and alignment with each other. It is equally important that, having been so advanced and having received a manifolded inscription, the registry and alignment be maintained while the interleaved transfer sheets are retracted into registry with the next succeeding set of superposed forms. In some prior art instances the strips must be held by hand While the transfer material is retracted. In other forms, studs are provided over which the advanced ends of the stripsmust be manually engaged before retracting the transfer material. In other instances manually adjusted clamps are employed. However, in no prior art instance is any means provided for automatically engaging and holding the strips against retrograde movement while the transfer material is retracted, and especially no positive record material feeding means has been provided for writing machines having such swinging type platen roll which duofunctionally holds the record strips in advanced relation while the transfer material is being retracted.

To provide positive strip feeding and automatic holding or retaining means for the record strips, the platen roll 7 is herein shown provided with reciprocatory pin type feeding units such as form the subject matter of Sherman Patent 2,000,649 and Sherman 2,000,651. It is to be understood, however, that other forms of feeding and automatic holding devices may be utilized in lieu of the construction shown and that the invention is not limited to the particular mechanism herein used for illustrative purposes.

Briefly described, the pin type unit herein illustrated comprises a plurality of independent radially disposed feeding pins 2| mounted for to and fro movement in radial directions in guides or bores in mounting heads 22, mounted concentrically with the platen roll for unison rotation therewith. At their inner ends the pins are notched at 23 for engagement over the flange of a normally stationary eccentric or cam 24 about which the pins are carried by the rotation of the mounting head and platen roll.

Due to the eccentricity of the control cam 24, the pins are progressively projected and retracted asthey approach and pass the high point of the cam 24. The greater portion of the cam being concentric with the platen roll, during the travel of the pins thereabout they are held in retracted relation within the periphery of the roll. Only a limited number of pins are projected beyond the platen roll at the same time, where they have progressive feeding engagement in longitudinally spaced feed holes 25 in the record strips to advance the strips about the platen roll and past the imprinting position.

The detail construction of the pin type unit assembly is illustrated in Fig. 11, wherein the mounting head 22, having therein'radial bores for the feedin pins 2|, is formed at one side with a hub 26 engageable within the tubular platen roll I and a concentric angular bead 2'! which seats within a corresponding groove in the end of the platen roll core. Pressed within the mounting head is a tubular bushing 28. At its opposite side the mounting head 22 is provided with a laterally extending flange 29. Located within the peripheral flange 29 and journaled upon anextension of the bushing 28 is a relatively oscillatory disc 30 into which is pressed a second bushing 3| carrying at the inner side of the disc the eccentric peripherally flanged cam 24, thereby fixedly secured for unison rotation with the disc 30. R: tatively mounted uponthe extension of the bushing 3| and adjustably secured to the disc 30 is an auxiliary disc 32 having therein relatively spaced notches 33 and a concentric slot 34. A clamp screw 35 engages through the slot 34 with the primary disc 39. auxiliary disc may be rotatively adjusted upon the supporting bushing relative to the primary disc 3| and re-secured thereto in its adjusted position. Loosely journaled upon the extremity of the bushing 3| is a bifurcated actuating lever 36 confined thereto by a collar or washer 3'! staked upon the end of the bushing. The bifurcated lever 36 carries a spring actuated pawl 38 engageable in either one of the peripheral notches 33 of the auxiliary disc 32. By swinging action of the bifurcated arm. 36 the interconnected discs 30 and 32 and the pin control cam 24. may be oscillated to cause the positionat which the pins are projected to be circumferentially varied. During the normal writing operation, while the platen roll is in its depressed position, the feeding pins 2| are projected from the upper forward quarter of the platen roll as shown in Figs. 3, 5, 6 and 7 As the platen roll is rotated by the usual line spacing means, the pins 2| are progressively projected into feeding engagement with the strips,

advance the strips a short distance, and are automatically withdrawn within the platen roll while their places are taken by succeeding, pins 2 l.

However, by rotatively changing the position of the eccentric or cam 24, the pins may be caused to be projected at difierent circumferential points of the platen roll.

A pin type head and bifurcated adjusting arm is provided at each end of the platen roll I. The furcations of the arms 35 straddle the tie rod or tear-ofi rod 20 carried by the swinging arms I9. To provide better bearing surfaces, the rod 23 is provided at each end with hearing collars 39 which fit within the slots of the arms 36.

When the platen roll is in its depressed strip feeding position as shown in Figs. 1, 2 and 3,

platen roll and, by their engagement in successive holes 25 of the strips as the platen roll ro- By loosening the set screw, the

the platen roll from the position shown in Fig. 3 to that of Fig. 4, the arms 36 being held by the rod against elevation, but having sliding pivotal motion relative thereto, are'reversed from their upwardly extending relation to inverted relation as shown in Figs. 4, 8 and 9.

Such reversal of the arms 36 efiects like reversal of the control cams 24' of the respective pin type units from the position shown in Fig. 6 to that shown in Fig. 9. The change from one position to the other occurs simultaneously with the shifting movement of the platen roll. As result, the protrusion of the feeding pins 2| is changed from feeding position near the top of the platen roll as shown in Figs.-3 and 6 to the strip retaining position near the bottom of the roll as shown in Figs. 4 and 9. During such change the pins are progressively, projected at all times.

intermediate points and hence maintain their engagement in'the holes 25 of the strips at all When the platen roll is in elevated position as shown in Fig. 4, the record strips extend rearwardly in a horizontal line as also shown in Fig. 4. This relaxes the binding tension upon the interleaved transfer sheets, which then may be freely retracted therebetween., The maintained engagement of the pins in the holes 25 of the record strips holds the strips against retrograde movement incidental to the frictional tenacity of the transfer material therebetween.

When the platen is in its normal depressed or writing position the pins are effective to advance the strips in unison with the rotation of the platen. feed pins are automatically shiftedwhile maintaining their engagement with the strips and then become the strip detent means' That is to say, the strip detent means is moved into and out of operative position or rendered alternately operative and inoperative to hold the strips against retraction by the shifting movement of the platen roll. In like manner the strip feeding means is alternated from operative to inoperative relation, and vice versa, by the same shifting tates, the strips are advanced past the writing position and upwardly over the rearwardly and upwardly extending paper guide 40.

However, upon upward swinging movement of adjustment of the platen roll.

To properly guide the paper strips and to' Md2 are pivoted at 43 to the bifurcated arms 36 at onemargin of the guide, and the opposite margin thereof is provided with a spring latch finger 44 engageable in a marginal notch 45 in the arm 36 to maintain the channel shaped guide in its adjusted relation relative to the slotted arm and to the platen roll. The enlarged ends of the paper guide member ll-42 are transversely slotted at 6 to provide clearance for the pins 2|. The pins 2| project through the holes 25 in the strips and thence through the slots 46. The stripsare thus held against accidental disengagementfrom the pins in any position of adjustment of the platen roll. When, however, it is desired to insert or remove strips, the spring latch finger M is disengaged from its notch 45 and the channel shaped guide member is swung away, from the platen roll, as is indicated by dotted lines inFig. 9. This enables sufiicient clearance tofpermit 'easy engagement orjdisengageme nt of the marginally punched strips and the pins 2|.

To enable the interchange of platens of dif- When, however, the platen is raised,,the-

ferent length, the. channel shaped guide 4l42 is preferably, although not necessarily, formed of two telescopic sections.

As a conventional part of the writing machin in association with which the present invention is illustrated, there is provided at one end of the platen roll a ratchet wheel 41, which comprises a part of the line spacing mechanism. Engaging the ratchet wheel when the platenroll is in its depressed or writing position is a spring pressed detent arm 48, having at its extremity a small roller which engages between the teeth of the ratchet wheelto locate the platen roll and yieldingly resist its rotation. By its shifting movement the platen roll and ratchet wheel move away from the detent 48. In the conventional machine, prior to incorporation therein of the present invention, the freedom of the platen roll for rotation in its elevated position is immaterial. However, for the automatic detention of the record strips by engagement therein of the pins 2|, it is desirable that rotation of the platen roll be restrained. For this purpose there is provided a second detent 45 mounted on a cross rod 50 of the machine and having engagement with the ratchet wheel 41 to restrain the platen roll against rotation throughout its range of bodily shifting movement, including both its operative and inoperative positions. However, the respective detents 41 and 49 yield to permit rotation of the platen by the usual line spacing mecha nism.

In the present device the feeding means is duofunctional and not only positively advances the superposed strips in aligned and registering relation in response to the line spacing mechanism, but also serves to retain such relatively adjusted relation when the platen roll is shifted to its inoperative or elevated position. The strip detent means in the present instance has engagement with the next succeeding forms or portion of the strips to be inscribed, thus maintaining its engagement with the strips while the inscribed portions thereof are being torn off. Furthermore, the detent engagement of the strips while the platen roll is in shifted position is automatic and the transition from feeding to detent relation, and vice versa, is progressive and continuous, the strips being never released.-

From the above description it will be apparent to enable retraction of the interleaved transfer sheets relative to the strips from registry with inscribed portions thereof into transfer relation with portions thereof to be inscribed, by which the record strips are subjected to frictional retractive influence of the relatively moving transfer sheets, characterized by an oscillatory lever pivoted concentrically with the platen roll and movable to and fro therewith, and a guide with which the lever has sliding pivotal engagement and past which the platen roll is shifted to and fro, the construction and arrangement being such that the lever is oscillated by the shifting movement of the platen roll, and strip engaging means controlled by the movement of the lever.

2. A writing machine of the type wherein superposed record strips and interleaved sheets of transfer material are progressively advanced about a platen roll, mounted for to and fro bodily movement into and out of writing position to enable retraction of the interleaved transfer sheets relative to the strips from registry with inscribed portions thereof into transfer relation with portions thereof to be inscribed by which the record strips are subjected to frictional retractive influence of the relatively moving transfer sheets, characterized by means for restraining the rotation of the platen roll while in its inoperative position, and strip engaging means carried by the platen roll having engagement with the strips to restrain retractive motion thereof under retractive frictional influence of the transfer material.

3. In a writing machine of the type wherein superposed record strips and interleaved sheets of transfer material are progressively advanced about a platen-roll, mounted for to and fro bodily movement into and out of writing position, to enable retraction of the interleaved transfer sheets relative to the strips from registry with inscribed portions thereof into transfer relation with portions thereof to be inscribed, by which the record strips are subjected to frictional retractive influence of the relatively moving trans fer sheets, detent means for restraining the rotation of the platen roll in its alternative posithat there is thus provided a device of the character described possessing the particular features of advantage before enumerated as desirable, but which obviously is susceptible of modification in its form, proportions, detail construction and arrangement of parts without departing from the principle involved or sacrificing any of its advantages.

While in order to comply with the statute the invention has been described in language more or less specific as to structural features, it is to be understood that the invention is not limited to the specific features shown, but that the means and construction herein disclosed comprise the preferred form of several modes of putting the invention into effect, and the invention is therefore claimed in any of its forms or modifications within the legitimate and valid scope of the appended claims.

Having thus described my invention, I claim:

1. A writing machine of the type wherein superposed record strips and interleaved sheets of transfer material are progressively advanced about a platen roll, mounted for to and fro bodily movement into and out of writing position,

tions of adjustment, and duofunctional strip engaging and feeding means for feeding the strips when the platen roll is in its operative position and for restraining the strips when the platen roll is in its inoperative positions.

4. A writing machine of the type wherein superposed record strips and interleaved sheets of transfer material are progressively advanced about a platen roll, mounted for to and fro bodily movement into and out of writing position, to enable retraction of the interleaved transfer sheets relative to the strips from registry with inscribed portions thereof into transfer relation with portions thereof to be inscribed, by which the record strips are subjected to frictional retractive influence of the relatively moving transfer sheets, characterized by a notched wheel concentric with the platen roll and movable to and fro in unison therewith, and a detent pawl also movable in unison with the to and fro motion of the platen roll and having engagement with the notched wheel in all positions of adjustment of the platen roll to restrain rotation thereof, and strip detent means carried by the platen roll effective to maintain the adjusted relation to the record strips against relative displacement intransfer material are progressively advanced about aplaten roll, mounted for to and fro bodily movement into and out of writing position, to enable retraction of the interleaved transfer sheets relative to the strips from registry with inscribed portions thereof into transfer relation with portions thereof to be inscribed, by which the record strips are subjected to frictional retractive influence of the relatively moving transfer sheets, characterized by a swinging arm connected to and automatically reversible in unison with the to and fro motion of the platen roll, and strip engaging means alternatively effective as strip feeding and strip detent means controlled by the movement thereof.

6. A writing machine of the type wherein superposed record strips and interleaved sheets of transfer material are progressively advanced about a platen roll, mounted for to and fro bodily movement into and out of writing position, to enable retraction of the interleaved transfer sheets relative to the strips from registry with inscribed portions thereof into transfer relation with portions thereof to be inscribed, by which the record strips are subjected to frictional retractive influence of the relatively moving transfer sheets, characterized by a pair of swinging arms connected to the platen roll and automatically reversible in unison with the to and fro movement thereof, a strip guide member carried by the arms and adjustable to different positions relative to the platen roll by the movement thereof, and strip engaging means alternatively effective as strip feeding and detent means con trolled by movement of the swinging arms.

7. A writing machine of the type wherein superposed record strips and interleaved sheets of transfer material are progressively advanced about a platen roll, mounted for to and fro bodily movement into and out of writing position, to enable retraction of the interleaved transfer sheets relative to the strips from registry with inscribed portions thereof into transfer relation with portions thereof to be inscribed, by which the record strips are subjected to frictional retractive influence of the relatively moving transfer sheets, characterized by a paper guide member extending in parallel spaced relation with the platen roll, automatic adjusting means therefor by which the paper guide member is moved into different circumferentially spaced positions relative to the platen roll by the to and fro shifting movement thereof, and duofunctional feeding and detent means for the strips effective alternately as a feeding and detent means respectively, carried by the platen roll and movable therewith in accordance with the adjusted position of the paper guide member.

8. In a writing machine, wherein superposed record strips having therein a series of longitudinally spaced holes for engagement by strip detent means and interleaved transfer sheets are progressively advanced about a platen roll, mounted for to and fro bodily shifting movement into and out of writing position, to enable retraction of the transfer sheets relative to the record strips out of registry with an inscribed portion thereof into transfer relation with a portion thereof to be inscribed, by which the record strips'are subjected to frictional retractive influthereof and having engagement in the longitudinally spaced holes of the strip,'and means for effecting relative adjustment of the pins and platen roll in unison with the to and fro motion thereof while maintaining engagement of the pins with the strips.

progressively advanced about a platen roll} mounted for to and fro bodily shifting movement into and out of writing position, to enable retraction of the transfer sheets relative to the record strips out of registry with an inscribed portion thereof into transfer relation with a portion thereof to be inscribed, by which the record strips are subjected to frictional retractive influence of the relatively moving transfer sheets, the combination with such strips of a series of strip engaging pins projecting beyond a restricted segmental portion only of the platen roll into engagement with the strips, and adjusting means therefor operative by the to and fro shifting movement of the platen roll to thereby change circumferentially of the platen roll the segmental area thereof wherein the pins are projected while maintaining their operative engagement with the strips.

10. In a writing machine, wherein superposed record strips having therein a series of longitudinally spaced holes for engagement by strip detent means and interleaved transfer sheets are progressively advanced about a platen roll, mounted for to and fro bodily shifting movement into and out of writing position, to enable retraction of the transfer sheets relative to the record strips out of registry with an inscribed portion thereof into transfer relation with a portion thereof to be inscribed, by which the record strips are subjected to frictional retractive influence of the relatively moving transfer sheets, the combination with such strips of a plurality of radially disposed pins forming the strip detent means carried by the platen roll and engageable in the holes in the strips in alternate circumferentially spaced segmental portions of the platen, and means for automatically circumferentially changing the strip engaging position of the pins in unison with the shifting movement of the platen roll while maintaining their engagement therewith.

11. In a writing machine, wherein superposed 'record strips out of registry with an inscribed ence of the relatively moving transfer sheets, the

stricted segmental portion only of the periphery portion thereof into transfer relation with a portion thereof to be inscribed, by which "the record strips are subjected to frictional retractive influence of the relatively moving transfer sheets, the combination with such strips of a plurality of pins, certain of which are engageable in the longitudinally spaced holes for advancing the strips and interleaved transfer sheets past a writing position when the platen I roll is in its normal operative position, and others of which form the strip detent means and are engageable when the platen is out of operative position in other of said holes in spaced relation with the feeding position of the pins for 'restrainingvretractive motion of the strips under frictional influence of the moving transfer sheets.

12. A writing machine of the type wherein superposed record strips and interleaved sheets of transfer material are progressively advanced about a platen roll and past a writing position and the platen roll subsequently bodily moved to an alternative position to enable retraction of the transfer material sheets relative to the record strips from registry with an inscribed portion thereof into transfer relation with a succeeding portion to be inscribed, by which the strips are subjected to frictional retractive influence, characterized by strip detent means carried by the platen roll and rendered effective by the movement thereof to prevent retractive movement of the strips in unison with the retraction of the transfer material sheets.

13. A writing machine of the type wherein superposed record strips and interleaved sheets of transfer material are progressively advanced about a platen roll and past a writing position and the platen roll subsequently bodily moved to an alternate position to enable retraction of the transfer material relative to the record strips from registry with an inscribed portion thereof into transfer relation with a succeeding portion to be inscribed, by which the strips are subjected to frictional retractive influence, characterized by duofunctional feeding and detent means for the strips, adjusted from feeding to detent relation and vice versa by the to and fro movement of the platen roll for restraining retrograde movement of the strips under frictional retrac-,

tive movement of the moving transfer sheets.

14. A writing machine of the type wherein superposed record strips and interleaved sheets of transfer material are progressively advanced about a platen roll and past a writing position and the platen roll subsequently bodily moved to an alternate position to enable retraction of the transfer material relative to the record strips from registry with an inscribed portion thereof into transfer relation with a succeeding portion to be inscribed, by which the strips are subjected to frictional retractive influence, characterized by strip holding means engageable with the succeeding portion of the strip to be inscribed in unison with the shifting movement of the platen roll for restraining retractive movement of the strip.

15. In a writing machine, wherein superposed record strips having therein successions of longitudinally spaced configurations for engagement of corresponding feeding means and interleaved position to advance the strips and interleaved transfer material past a writing position, means for retracting the interleaved sheets of transfer material relative to the record strips when the platen roll is shifted to its alternative inoperplaten roll engageable with the strip configurations rendered effective by the shifting movement of the platen roll for holding the strips in their advanced positions against retractive influence of the interleaved transfer sheets during retraction thereof.

16. In a writing machine of the type wherein superposed strips and interleaved sheets of transfer material are progressively advanced past a writing position, and during which advance movement the superposed strips and sheets are under tension in the direction of advance movement, and the tension on the strips and sheets subsequently relieved to enable retraction of the transfer sheets relative to the record strips from registry with an inscribed portion thereof into transfer relation with a succeeding portion to be inscribed, by which the strips are subjected to frictional retractive influence, characterized by duo-functional feeding and detent means, carrier means therefor mounted for adjustment from feeding to detent relation coincidentally with the release of the strips and sheets from tension in the direction of advance movement thereof for restraining retrograde movement of the strips under frictional influence of the moving transfer sheets during retraction thereof.

17. In a writing machine wherein superposed strips having therein a series of longitudinally spaced perforations for feeding engagement by a pin type feeding device and interleaved sheets of transfer material are progressively advanced past a writing position, and during which advance movement the superposed sheets and strips are under tension in the direction of advance movement, and the tension on the strips and sheets subsequently relieved to enable retraction of the transfer sheets relative to the record strips from registry with an inscribed portion thereof into transfer relation with a succeeding portion to be inscribed, by which the strips are subjected to frictional retractive movement, the combination with such strips of a feeding and detent mechanism and a carrier therefor mounted for adjustment from feeding to detent relation including a traveling series of pins progressively engageable in the spaced perforations in the strips and adjusted from feeding to detentrelation with the strips coincidentally with release of the sheets and strips from tension in the direction of advance movement thereof for restraining retrograde movement of the strips. under frictional influence of the moving transfer sheets during retraction thereof.

18. In combination with the carriage of a typewriting machine, a platen rotatably mount? ed in the carriage, said platen being provided with one or more rows of movable pins disposed circumferentially of the platen and movable radi ally of the axis of rotation ,of the platen and having controlling means cooperating with the pins for causing some of the pins to be projected beyond the surface of the platen as the platen rotates, said pins normally being caused to project the greatest extent on the side of the platen on which the writing line is located whereby to align a pack of superposed forms at the writing line, means to displace the platen fromits normal position to a non-typing position, means automatically operative, when the platen is displaced to the non-typing position, to cause the pin controlling means to retract the pins at the side containing the writing line and to project the pins at the side of the platen confrontingthe space occupied by the platen jwhen intyping position, and means movable with the platen for retaining the forms in contact with the platen and in registry with said pins when the platen is displaced to its non-typing position.

19. In combination with the carriage of a typewriting machine, a rotatable platen including a row of circumferentially disposed aligning pins mounted on the platen for movement radially of the axis of rotation of the platen, cam means coacting with said pins for projecting the pins only on one side of the platen to register the forms at the writing line, means interconnecting the cam means with a relatively fixed part of the carriage and operative, when the platen is displaced to a non-typing position, to cause the cam means to protect the pins at the side of the platen confronting the space occupied by the platen in its typing position whereby to permit forms wrapped around the platen to be stretched out fiat without disengagement of the forms from said pins, and means coacting with the platen in its movement from typing to non-typing position for retaining the forms loosely in registry with the pins.

20. In combination with the carriage of a typewriting machine, a movable frame mounted on the carriage, a pin feed platen mounted on said frame and comprising rows of pins movable radially of the axis of rotation of the platen,

a shaft internally of the platen and projecting externally thereof, cams located upon the shaft internally of the platen and cooperating with said pins .to move the pins radially of the platen, each of said cams being so shaped that when the cam is held immovable, with the platen in its typing position, the pins will project beyond the platen at the side of the platen having the writing line so as to register the respective plies of a pack of forms provided with form aligning perforations engaged by said pins, an arm connected to said shaft externally of the platen,'said arm having a cam slot embracing a relatively fixed part of the carriage whereby, when the platen is displaced to a non-writing position, the cams will be rotated to withdraw the pinsat the writing line and to project the pins at the side of the platen confronting the space normally occupied by the platen when in its typing position whereby to hold the forms in alignment when the platen is displaced, and means operative when the frame is moved to retain the forms in cooperation with the pins to permit the forms to be stretched out flat Without disengagement thereof from the pins.

' JOHN Q. SHERMAN. 

